Topic: Unknown cam - Data seen before?

[PeWe]

Help to identify cam.
I found an interesting cam on eBay I had to purchase. I have mounted it in the engine and it is hotter than it looked like.
It has no clear markings that say which manifacturer or model. (I hoped it was a more modest Andrews that it can't be)

The cast billet markings are same as other cams I have. Action Fours SS-1 from early 80's and CX-7 from 2012.
I guess that the billets are made by same company.

All markings are same except for unknown cam has C¤25
The other cams marked K¤22 on AF SS-1 and K¤18 on CX-7

Except for the marking in the cast, there is a carving on the washer side. Visible in side lights only, like the crankshaft markings from Honda.
295 is visible. Before that RC? But I do not know if RC295 cam had similar data. Below the timing I'll got and willl use.
Did RC really mark the cams like this? Or another cam? The measured data is not that far away from Megacycle 125-75 spec.

Total lift IN/EX: 9,98 mm (.393")/9,22 mm (.363")

@ 1mm (0.04")lift,  0 lash
IN: 25/55    Dur: 260     LC: 105,00      
EX: 55,5/22 Dur: 257,5  LC:   106,75 
Overlap 47°

@ 1,25mm (0.05") lift, 0 lash      
IN: 21/51,5    Dur: 252,5  LC: 105,25
EX: 51,5/17 Dur: 248,5  LC: 107,25
Overlap 38°

I'll run it tomorrow when I have not glued the cam bolts yet, they need time to harden. Blue threadlocker.

[BPellerine]

maybe someone had a cam grinder make him a 295 copy,all of the older rc cams that I have seen pics of and my 315 are stamped on the washer side not scribed like that,should be specs for the 295 somewhere on here.billp

[PeWe]

Yes, I have had thoughts about a regrind. It must be possible to copy a cam profile like copy a key, right?

It would be fine if someone has timed an RC295 (and DP295) and saved the result.
- Max lift IN/EX
- IN open°/close° @ .04" (.05 OK too when I checked mine at both)
- EX open°/close°.

It does not matter if the cam was advanced or retarded since all degrees can be recalculated when its SOHC.

I started the bike and fine adjusted the ignition 30 minutes ago, good old points  with Hondaman module. Idle surprised me, very stable idle at 1200 rpm (I do not want lower idle to ensure oil pressure to the cam, 1200 may be a little low).
Time for road test.

[Terry in Australia]

That's interesting PeWe, as Bill has said, RC stamped all their cams, all 3 RC cams I had were stamped, but if it was a cam that had been welded up and reground you'd be able to see the old profile under the different coloured weld material.

The only thing I can think is that it was a bigger cam again, and someone ground it down to it's current profile. I'll be interested to see how the bike goes with that cam in it. Cheers, Terry.

[BPellerine]

cool not many running that cam,hope it is good for the street.bill

[PeWe]

I cannot see any added material as I can do on my welded Megacycle 125-20 cam with lobes looking like Mickey Mouse.

I tested the cam today with good result! The cam is very streetable with a stable torque from low.  It stops around 9500 rpm as my old Action Fours SS-1. Geared up to 3:rd, 4:th at 9500 rpm and 5:th at 9000rpm.

No screaming cam that start to pull a lot around 7000 and pass the entire redline area on the tacho as the red area does not exist as my Megacycle 125-20 do. (I miss that, but I cannot get both, maybe with 1000cc and the wilder cam??)

Compared with my old SS-1 that have been a good street and touring cam, this new "Mystic cam" has better response from 4000 rpm on 5:th gear. I just happened to notice that when its a normal cruising speed and gear on the country roads.

I really recommend a cam with similar data to a street and touring bike. I have not tested the fuel economy yet but I guess it will not take more than my old touring cam when driving according to the strange signs with numbers on beside the roads. 

RC295, Andrews D cams can be Ok too Need to find them first.

My old Action Fours SS-1 I refer to as earlier ref at last install:
Total lift IN/EX: 9,17 mm (.361")/9,17 mm (.361")
@ 1mm (0.04")lift,  0 lash
IN:22/55   Dur:257   LC:106,5
EX:56/24   Dur:260  LC:106
Overlap. 46°

The measured data of the RC295 would be nice to compare with.  I have seen old data sheets and I'm not sure if the data is either total durations from 0 or sometimes with running lash.....

My Mystierious cams data at .05" lift with running lash subtracted from each number come close to the DP295 cam card. IN -2 degrees  vs -3 degrees on EX (lash 0.10mm/0.15mm). -4 vs -6 degrees on the duration.
I have notes when I timed CX-7 with running lash and 0.

DP295 cam card however, is very strange when the specified durations are much higher what the open closing numbers give when calculate on them.

[Jerry Rxman Griffin aka MuthaF'er]

I'm going to say Webcam made. Looks like my DP315 except they engraved mine on the sprocket shoulder with DP315.

[BPellerine]

pewes description of performance seems to match some of the ads for the rc cams.bill

[PeWe]

I'm going to say Webcam made. Looks like my DP315 except they engraved mine on the sprocket shoulder with DP315.

That can be the case here. I saw a TV show where they buy, restore and sell cars. (Wheeler Dealers season based in USA) They have their work shop in CA and visited Webcam and got a cam done for them.
Maybe they did a grind based on a RC295.  Only one more thing...Action Fours, they got their cams made by WebCam?
Or, an early DP295 from Dynoman that Webcam make?

pewes description of performance seems to match some of the ads for the rc cams.bill

Yes, that's why I hope to get timing data from someone that has installed a RC295 and DP295. The good thing here is that I have been thinking about getting a RC295/DP295 for some years. It seems to work very well with 836 (probably NOS cast RC that need opened chambers as my head has), ported head, 34mm inlet valves.  The engine sound like one step bigger with this cam.
RC315 next to test.....? Easy to become a cam horder when it is rathher quick job to swap cam by open the frame.

I'll drive more today. I have raised the needles in my carbs so it will work even better on very low throttle lift. Soon time for see if Irridium plugs will make a difference.

[BPellerine]

nice to find a cam that pulls at lower revs for the street!bill

[PeWe]

Yes, best cam I have used with my 836. 
Strange what some additional lift can do compared with my old cam! +0.8mm IN, +0.5mm EX and similar duration.

I have tested CX-7 but with not good carb setup and some ign problems. That cam woke up at 7000rpm and I had to hold hard in the bar then. Similar with the 125-20. I guess both the other cams need more displacement than 836cc. The new cam pulls much harder between 4000-7000 rpm.

[BPellerine]

sounds nice pewe,that is where most of us drive anyway,I have 315 but have not completed my engine to try it with my webers.bill

[Jerry Rxman Griffin aka MuthaF'er]

sounds nice pewe,that is where most of us drive anyway,I have 315 but have not completed my engine to try it with my webers.bill

+1

[PeWe]

Bill, I'm curious about how yor RC315 will behave. 836 or more?

//Per

[BPellerine]

I am curious too,this cam came out of an 836 with webers and is going in a bike 836 weisco,with webers,754s motor was like that and the motor the cam came out of was like that,rc describes their cams as starts pulling low and does not stop,sounds a bit like your 295?others have had this setup maybe they will chime in.bill

[754]

The 315 pulls very hard at 4k with the webers.. And I had stock ports.836cc
 Might be getting my mystery cam back.. Got it in an 836.. Cam was marked Luther 1 I think.. It got alot of use I. A buddies 836.....i hated that cam in the motor that I got it in but I think the high compression modded 350 twin pistons did not help..

[PeWe]

I guess I have to find a RC315. This was developed for bigger bores, right? 1000cc to ensure more bottom torque, 315 cam that make higher rpms.
DP315 is exactly the same?

[BPellerine]

don't know if they were made for a specific size engine,but they seem to be in a lot of 836 and up,my cam has a little diff specs than the newer ones.do a search for rc 315 with org timing card.that is my cam.bill

[PeWe]

OK, I must have one!

[Retro Rocket]

The old drag bike I bought only had a 776cc engine and had a RC315 in it, it ran on methanol and ran in the 10's...

[PeWe]

The old drag bike I bought only had a 776cc engine and had a RC315 in it, it ran on methanol and ran in the 10's...

Good bottom torque too?
Most of the RC315 cams are nowadays collectible items at display on CB750 horders bookshelves?

[Terry in Australia]

The old drag bike I bought only had a 776cc engine and had a RC315 in it, it ran on methanol and ran in the 10's...

Good bottom torque too?
Most of the RC315 cams are nowadays collectible items at display on CB750 horders bookshelves?

Probably the best place for them mate, they're like Megacycle's 125/75, totally useless on the street, only good for flat out drag racing. Cheers, Terry.

[754]

Quiet the opposite on mine Terry. I would short shift, just to feel it pull...it's making power at 4K....could be my cards/pipes coming into play a bit too..
 I found it amazing that the same cam that set them records in the fuel classes, could also work well on the street .

[Jerry Rxman Griffin aka MuthaF'er]

The old drag bike I bought only had a 776cc engine and had a RC315 in it, it ran on methanol and ran in the 10's...

Good bottom torque too?
Most of the RC315 cams are nowadays collectible items at display on CB750 horders bookshelves?

Probably the best place for them mate, they're like Megacycle's 125/75, totally useless on the street, only good for flat out drag racing. Cheers, Terry.

Do you roo humpers not twist throttles on the street?  Then again you don't ride F's LOL. Guess I gotta reconsider my 900 with the 125/75 and my 1000 with the 315. Dammit! Now you've ruined my day Terry. back to the garage and the 2 F'n's. And Frank feels it too 

[PeWe]

The old drag bike I bought only had a 776cc engine and had a RC315 in it, it ran on methanol and ran in the 10's...

Good bottom torque too?
Most of the RC315 cams are nowadays collectible items at display on CB750 horders bookshelves?

Probably the best place for them mate, they're like Megacycle's 125/75, totally useless on the street, only good for flat out drag racing. Cheers, Terry.

Good input here, Terry! 
You have tried the RC315 cam?  295 too? Huge difference?

I hope to find a real RC295 reading noted at a timing session to compare with. My cam that works really well in my engine has some additional lift compared with the DP295 cam card. Almost like a 125-75 with less duration, but only a few degrees less. Ex lift a little bit less as well. 
My readings might differ 1 degree here and there if I time it again when the lash in valve train might differ due to oil film. I tightened the adjuster screws until I saw the retainer move 0.01-0.02mm on dial indicator to ensure 0 lash. (Before that tighetened more to force the moving parts in position, then relase and tighten again)
My cam vs 125-75:
IN: 25/55 vs 26/56  EX: 55,5/22 vs 53/24
IN 0.393 vs 0.400 EX: 0.363 vs 0.375.